This laser calibrator is made of high-grade aluminum alloy material, which is lightweight, high in strength, corrosion-resistant, and designed for a long service life. The product includes a full set of accessories, ready to use upon arrival and convenient to operate. Features: - Constructed from high-grade aluminum alloy for durability, light weight, and resistance to corrosion - Infrared calibrator with laser light that provides long-distance, bright, and clear visibility to assist in precise calibration adjustments - High-precision, adjustment-free design utilizing laser technology for more convenient and accurate alignment of straight tubes - Simple and sleek battery compartment design; the tail cap can be unscrewed for easy access, making it practical and user-friendly How to use the collimator: 1. Measure the inner diameter of the tube and select a suitable adapter (8 small black tips included). 2. Use a crosshead screwdriver to attach the adapter to the tail of the collimator tube. 3. Ensure the collimator is aligned in a straight line by securely tightening the battery compartment and switch to maintain pen body straightness. 4. Tighten the adapter and insert the tail tube into the target tube, ensuring the switch side is facing upward. Secure the device and calibrate using a sight or scope. 5. Adjust the sight or scope until the collimator's light dot is parallel to the target point for accurate alignment.